[BNM] Is a robots.txt file necessary for SEO?

[AndrewGill73@gmail.com]

Until recently I havent bothered including a robots.txt file in any
websites. Search engines spidered these websites ok.

After reading so many recommendations on the web about SEO, I've added a
robots.txt file containing just two lines (below) which apparently will mean
that search engines will spider the website (it was happening anyway).

Robots.txt just contains:
User-agent: *
Disallow:

Does anybody know whether I will see a noticeable difference in traffic or
will it be exactly the same?
Should i spend time adding this file to all websites in the future or is
this just a waste of time?

Cheers
Andy
_______________________________________
Andrew Gill
Mobile: +44 7880 730096 | Skype: andrewgill73 |
http://www.linkedin.com/in/andrewgill